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Minecraft Modern Minecraft Modern is the latest (and only updated) version of Minecraft which requires a paid account to download, update and play. Most of the new development projects focus on either creating entirely new programs from scratch that interoperate with Minecraft (such as a bot or server) or modding projects that wrap the client or server and provide bug fixes, new features and enhancements to existing features. Documentation There are ongoing efforts to keep reverse engineered documentation updated, but it isn't as easy as it sounds. The protocol generally changes with each release, and both the Client and Server classes get rearranged on each release. Below are links to the current documentation segments, which may or may not be up to date. Protocol FAQ Current Protocol Specification Pre-release Protocol Specificaton Server_List_Ping documentation Rcon and Query protocol specifications Authentication Scheme Protocol Encryption Location of Game Files Snoop Mechanism Map Format (See also: mirror of the old NBT.txt) Debugging Tools & Mods Clients - third-party Minecraft clients. Servers - third-party Minecraft servers. Libraries - libraries to interface with Minecraft data files or network protocols. Utilities - tools that interface with a client, server, or data files, such as proxies, bots, or inventory editors. Wrappers - mods that override features in the client or server Burger Vitrine shows differences in data and protocol between arbitrary versions. Code Snippets Tutorials & Guides How to Write a Client How Chat Works For more info, check out Minecraft Modern.

Minecraft Classic Minecraft Classic is the original version of Minecraft, available for free to the public. It's still available off of the main website today and is still played by many people, with an active development community. As it's been around since 2010, and because it's so simplistic, there are many, many programs made to work with Classic - there are over 18+ servers alone, written in everything from C++ to PureBasic to Perl. It's highly recommend if you're planning to do a development project at this point to instead look into the Minecraft Modern specifications. Documentation As there is no longer any work being done on classic, the documentation for it is stable. If you create something that works with it, it probably always will. Protocol Specification Server Map Format (.dat) Saved Level Format (.mclevel) Source Code Snippets Source code snippets provide insight into how specific features work or can be accomplished, and by themselves are generally free to use in your own program. Deserializing the level.dat file format (C, C#) More... Tools and Mods Useful information & links Clients - third-party Classic clients. Servers - third-party Classic servers. Libraries - libraries to interface with Minecraft data files or network protocols. Utilities - tools that interface with a client, server, or data files, such as proxies or bots. Wrappers - mods that override features in the client or server. For more info, check out Minecraft Classic.

Minecraft Pocket Edition Pocket Minecraft is the version of Minecraft for portable systems such as Android or iOS devices. It currently has very little documentation. Documentation The documentation for Pocket Minecraft is currently lacking and needs improvement. Protocol Specification FAQ Pocket Realms Map Format Tools Useful information & links Program list - third-party PE programs For more info, check out Pocket Minecraft.